Thanks for the info!

I checked the web and found a photo of a 77W. I think it was cathay but row 31 did not have a window.

I just found another site called seatexpert and for the 763, it states obstructed view.

For the 77W, where the window is shown for rows 31 and 50, it is filled in with red color but there is no explanation. There is a note when you click on it but the absence of a window is not mentioned.

Any further comments are appreciated. Thanks again!